Perylene-containing polysiloxane: An effective candidate for corrosion protection of iron surface

A new modified polysiloxane, perylene-containing polysiloxane (PCP), was successfully synthesized by amine-terminated polysiloxane (ATP) and 3,4,9,10-perylene tetracarboxylic dianhydride. The synthesized compound was characterized by Fourier transform infrared spectroscopy (FT-IR) and ¹H nuclear magnetic resonance (¹H NMR). The thermal analysis of the PCP indicates that the modified polysiloxane has outstanding thermal stability. The PCP also possesses good fluorescence property. Due to the appearance of lone-pair electrons and π bond in PCP, it could be self-assembled on iron surface and thus used in the corrosion protection area. The PCP films were characterized by EIS (electrochemical impedance spectroscopy) and SEM (scanning electron microscopy). These results indicate that the films modified by PCP could protect the iron from corrosion efficiently.     

Matrix‐Free and Highly Efficient Room‐Temperature Phosphorescence Carbon Dots towards Information Encryption and Decryption

Designing efficient room‐temperature phosphorescence (RTP) carbon dots (C‐dots) without the need of an additional matrix is important for various applications. Herein, matrix‐free and highly efficient C‐dots with yellow‐green RTP emission have been successfully synthesized towards information encryption and decryption. Phytic acid (PA) and triethylenetetramine are used as molecular precursors, and a facile microwave‐assisted heating method is selected as synthesis method. The obtained C‐dots exhibit a maximum phosphorescence emission at around 535 nm under an excitation wavelength of 365 nm and a long average lifetime up to 750 ms (more than 9 s to the naked eye). PA containing six phosphate groups and serving as P source plays a significant role in producing the RTP C‐dots. Furthermore, potential applications of the RTP C‐dots in the field of information encryption and decryption are successfully demonstrated.     

Brønsted Acidic Ionic Liquids as Efficient and Recyclable Catalysts for Protection of Carbonyls to Acetals and Ketals Under Mild Conditions

A series of acidic ionic liquids have been used as efficient catalysts for the protection of various carbonyl compounds at room temperature. The features of mild conditions, satisfactory isolated yield, simple workup, and the recyclability of the catalyst were present in this process.     

Synthesis and Characterization of 4′-Bromomethyl-2-(N-trityl-1H-tetrazol-5-yl) Biphenyl

Biphenyl tetrazole ring is an important component of the Sartan family of novel drugs. 4′-Bromomethyl-2-(N-trityl-1H-tetrazol-5-yl)biphenyl was synthesized in this article from 4′-methyl-2-cyano-biphenyl through three steps. 4′-Methyl-2-cyano-biphenyl was reacted with azide ions with the help of ammonium chloride as catalyst in an autoclave with high conversion to afford the tetrazole compounds in 70.6% yield. After being protected by the trityl group with 92.6% yield, 4′-methyl-2-(N-trityl-1H-tetrazol-5-yl) biphenyl was brominated with N-bromosuccinimide (NBS) in cyclohexane with 2,2′-azo-isobutyronitrile (AIBN) acting as an initiator to provide the title compound in 83.8% yield.     

云存储系统中支持用户隐私保护的细粒度访问控制

从云存储实际需求出发,设计了一个云存储环境下支持用户隐私保护和用户属性撤销的多属性权威的属性加密机制,为了保证系统实现的效率和减轻数据持有者的负担,在属性撤销中,复杂的计算任务都委托给可信第三方或云服务器完成。所提方案在DBDH假设下被证明是安全的。     

基于STC89C52的电力线路过流保护实验装置研究

论文以典型的电力线路三段式过流保护为主要内容,设计了基于单片机STC89C52三段式过流保护等模拟实验功能;具有体现继电保护不同硬件形态的全面性特点。基于单片机的保护功能除具有三段式保护功能外,还具有零序电流方向保护的实验功能,可用于验证微机式继电保护所具有的可靠性、使用和功能扩展的方便性。     

Estimation of accurate effective loss rate for FEC video transmission

We propose an algorithm for adjusting data transmission parameters, such as the packet size and the code rate of forward error correction (FEC), to obtain maximum video quality under dynamic channel conditions. When determining transmission parameters, it is essential to calculate an accurate effective loss rate that reflects FEC recovery failures and over-deadline packets. To this end, we analyze the delays caused by FEC coding and the potential packet size variations. In our analysis, we consider the effect of delayed transmission of video packets incurred by the parity packets as well as the encoder and decoder buffers. With the analysis reflecting the delay effect, we are able to accurately estimate the delay patterns of all video packets. Based on the analysis results, we establish an accurate model for estimating the effective loss rate. Simulations show that the proposed effective loss rate model accurately estimates the effective loss rate and significantly improves the reconstructed video quality at the receiver.     

光电设备激光防护技术研究进展

为削弱激光对光电设备的损伤,提高复杂战场环境下光电系统的生存能力,光电设备需要采取必要的防护措施。总结了目前基于线性、非线性和相变的激光防护技术和材料,包括薄膜结构、光子晶体结构、聚合物结构、微镜结构等,分别说明了各种结构的防护机制、性能参数、适应性等指标以及未来的研究方向,最后指出激光防护技术的发展趋势。     

浅析通信领域中实用新型专利申请的撰写要求

介绍了实用新型保护客体的基本概念和其在通信领域所具备的特殊性,结合了具体审查案例,分析申请人撰写不同类型申请的具体要求,其中对涉及计算机程序的申请进行了详细分析,使得专利申请满足撰写要求而被授予实用新型专利权.     

涉及程序的实用新型保护客体研究

《专利法》第二条第三款是对实用新型的定义,该定义旨在保护对产品的形状、构造或其结合所提出的适于实用的新的技术方案,并不涉及该产品的形状、构造的改进是由材料或方法特征所带来的,还是由其他特征所带来的.计算机程序作为方法特征的一种明显被排除在实用新型专利的保护客体之外.结合与程序相关的实际案例对其是否属于专利法第二条第三款规定的保护客体进行探讨,希望对依据该条款的审查有所帮助.